Twist Light Makes Breakthrough Quantum Computer Chips

Quantum computer It can significantly exceed traditional computers, but at this time it is mostly limited to labs and large experimental setups. Japanese researchers are now taking a step towards more accessible quantum computing devices and finding ways to “twist” light at room temperature.

Some types of quantum computers Photon As particles that carry those data. To encode the information into these photons, the electrons in the device are manipulated into a specific state that represents either 0 or 1. Then, when these electrons interact with a particular luminescent material, they pass this information to the photon, which can store and send it.

One of the new ways to encode data in quantum computers is known as valley polarization. Basically, electrons can be in several different energy bands, with low-energy “valleys” between them. When the electrons in these valleys generate light in the device, they create a circular pattern of polarized light that can twist to the left or right (a property called chirality). This has great potential for the storage and transmission of quantum information.

The problem is that this kind of twist, chiral, and valley polarization can usually only be generated using strong magnets and temperatures near absolute zero, so it remains in the area of ​​large laboratory setups. However, in a new study, researchers at Nagoya University have found a way to generate this light at room temperature without magnets.

In early experiments, the team created a semiconductor device that produces light at temperatures up to -193 ° C (-315 ° F). They observed that some sections of the device produced chiral light at warmer temperatures, but only where the substrate was distorted during synthesis. If the substrate was not distorted, no chiral light would be produced until the temperature dropped significantly.

To test the hypothesis that strain plays a role, the team created a new device made of tungsten disulfide on a plastic substrate. They bent the device to strain the material and found that the current was generated in the same direction as the strain. As a result, valley polarization occurred at room temperature. An electric field can be applied to switch the lights and move them in the opposite direction.

“The use of distorted single-layer semiconductors is the first demonstration of a light-emitting device that can electrically generate and switch between clockwise and counterclockwise circularly polarized light at room temperature,” said Daishi, co-lead author of the study. Takenobu states.

The team says this breakthrough could lead to more powerful consumer-level quantum computing devices. Future work will focus on optimizing the system for that possibility.

The study was published in the journal Advanced material..

sauce: Nagoya University Twist Light Makes Breakthrough Quantum Computer Chips

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